Calculation of power audio amplifiers

Hi Speed · 13th February 2004, 11:29 PM

Hi all

I have some formulas to determine the power output in audio amplifiers, ( Class B, AB etc ) but I'm confuse because I don't know what use, example, what I use to calculate the rsm and peak power in Leach amp?

Hi Speed · 13th February 2004, 11:34 PM

Another one

Nelson Pass · 14th February 2004, 12:48 AM

If you're just talking about a clean sine wave driving a
resistor, the peak power is twice the average / rms

sam9 · 14th February 2004, 12:59 AM

Take a look at this site:

http://www.signaltransfer.freeuk.com/powerout.htm

If Vcc is taken to simply be the rail voltage your formula may be bit optimistic. Rload is the usual nominal 8 ohms. the calculation in the above web site also takes saturation loses and the Re resistor into account, which seems to me to be a bit more correct

In any case, that formula represents the power just before clipping. It's ok as a nominal standard that everyone understands, but it seems to me that something better could be devised since even just before clipping commences, distortion has usually started to increase pretty dramatically. For most any amp, if you plot distortion vs. power, it will rise only gradually until shortly before max power is reached and then it shoots up dramatically. I would like to see a standard calculation that specifies some way to rate the power at a point before the dramatic rise in distortion starts. I think that would be somewhat more useful for making comparrisons - - but what do I know?

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14th February 2004, 12:48 AM	#3
Nelson Pass The one and only Join Date: Mar 2001	If you're just talking about a clean sine wave driving a resistor, the peak power is twice the average / rms

14th February 2004, 12:59 AM	#4
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Take a look at this site: http://www.signaltransfer.freeuk.com/powerout.htm If Vcc is taken to simply be the rail voltage your formula may be bit optimistic. Rload is the usual nominal 8 ohms. the calculation in the above web site also takes saturation loses and the Re resistor into account, which seems to me to be a bit more correct In any case, that formula represents the power just before clipping. It's ok as a nominal standard that everyone understands, but it seems to me that something better could be devised since even just before clipping commences, distortion has usually started to increase pretty dramatically. For most any amp, if you plot distortion vs. power, it will rise only gradually until shortly before max power is reached and then it shoots up dramatically. I would like to see a standard calculation that specifies some way to rate the power at a point before the dramatic rise in distortion starts. I think that would be somewhat more useful for making comparrisons - - but what do I know?

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